Scrubber mod question

[kenith]

I have a working scrubber thats doing well, but way oversized for my bulbs (96 watts (4x23 CFL) on a 13.5"x23" screen). It is enclosed in a acrylic box and am in the process of changing the size to 13.5" x 9" (2" underwater).

Question is the bulbs are 1.5" away from the screen (reflectors are pressed against the acrylic box). I do get yellow thick growth in the middle of the bulbs, and way too much brown on the outside. Are the bulbs too close to the screen or is the distance okay? I can build a new box that'll make them 3-4" away from the screen. TIA

[SantaMonica]

Never back them away. Just run them less hours.

[kenith]

if I get yellow, back off the hours then?